The avian respiratory system is different from that of other vertebrates, with birds having relatively small lungs plus air sacs that play an important role in respiration (but are not directly involved in the exchange of gases). The air sacs permit a unidirectional flow of air through the lungs.
Also, what is the function of alveoli or air sacs?
Alveoli are tiny sacs within our lungs that allow oxygen and carbon dioxide to move between the lungs and bloodstream. Learn more about how they function and quiz your knowledge at the end.
What is the name of the tiny air sacs in the lungs?
Explanation: The tiny air sacs of the lungs are called Alveoli. At the end of the bronchiole are tiny branches called Alveolar Ducts which end in clusters of sacs called Alveoli. The Alveoli are surrounded by capillaries.
Why do birds have air sacs as well as lungs?
Birds do not have a diaphragm; instead, air is moved in and out of the respiratory system through pressure changes in the air sacs. Bird lungs do not expand or contract like the lungs of mammals. In mammalian lungs, the exchange of oxygen and carbon dioxide occurs in microscopic sacs in the lungs, called 'alveoli.'